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Product Specifications:
| Item | Roller Chain Sprocket |
| Bore Type | Bushed |
| Bushing Part Number | JA |
| Bushing Size | JA |
| Bushing Type | Type JA QD |
| Chain Number | 40 |
| Chain Pitch | 1/2" |
| Chain Size | #40 |
| Construction | Solid |
| Construction Type | Solid |
| For Chain Number | 40 |
| For Chain Pitch | 1/2" |
| Hub Configuration | B |
| Hub Dia. | 2 1/8" |
| Hub Outside Dia. | 2 1/8" |
| Individually Packaged | Yes |
| Length Through Bore | 1 1/16" |
| Length Thru Bore | 14/25" |
| Material | Steel |
| Max. Bore Size | 1 1/4" |
| Min. Bore Size | 3/8" |
| No. Of Chain Rows | 1 |
| No. Of Teeth | 18 |
| Outside Dia. | 3.136" |
| Pitch | 1/2" |
| Pitch Dia. | 2.879" , 2.8794" |
| Single Strand Tooth Thickness | 0.284" |
| Storage Dimension Height | 3/4" |
| Storage Dimension Length | 3 3/16" |
| Storage Dimension Width | 3 3/16" |
| Type | QD Bushed Type B |
Shipping Info:
| Ship weight (kg) | 0.27 |
| Ship height (cm) | 2.69 |
| Ship length (cm) | 7.98 |
| Ship width (cm) | 7.98 |
| Country of Origin | US |
Product Variants
| Product | Model | Pitch Dia. | Outside Dia. | Hub Dia. | Length Through Bore | Bushing Type | For Chain Number | For Chain Pitch | Bore Dia. | Price | |
|---|---|---|---|---|---|---|---|---|---|---|---|
![]() |
40JA15 | 2.405" | 2.652" | 2.05" | 1 1/16" | Type JA QD | 40 | 1/2" | - | €58.34 | |
![]() |
40JA16 | 2.563" | 2.814" | 2.062" | 1 1/16" | Type JA QD | 40 | 1/2" | - | €61.11 | |
![]() |
40JA17 | 2.721" | 2.975" | 2 1/8" | 1 1/16" | Type JA QD | 40 | 1/2" | - | €66.70 | |
![]() |
40JA19 | 3.038" | 3.296" | 2 1/8" | 1 1/16" | Type JA QD | 40 | 1/2" | - | €76.26 | |
![]() |
40SH20 | 3.196" | 3.457" | 2.688" | 1 5/16" | Type SH QD | 40 | 1/2" | - | €82.44 | |
![]() |
40SH21 | 3.355" | 3.617" | 2 3/4" | 1 5/16" | Type SH QD | 40 | 1/2" | - | €89.22 | |
![]() |
40SH22 | 3.513" | 3.778" | 2 3/4" | 1 5/16" | Type SH QD | 40 | 1/2" | - | €95.14 |
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Contact us
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We're available Monday through Friday, from 07:30 until 17:00.
MARTIN SPROCKET 40JA18 Sprocket, QD, 40 Chain, 18 Teeth, 2.879 Inch Pitch Dia., 3.136 Inch O.D., Steel
€71.31 /unit







